CSX/L&N and NS/Sou Bridges over Tennessee River in Knoxville, TN

NS/Southern: (Bridge Hunter; Historic Bridges; 3D Satellite) 1850s stone piers for a covered wood span, but now with 1903+ trusses
CSX/L&N: (Bridge Hunter; Historic Bridges; 3D Satellite)

NS/Southern

Street View

Street View

E.m. Bell posted
The NS K&A local eases across the Tennessee River Bridge, framed by the arches of the Henley Street bridge.  Knoxville Tennessee 2010. NS K&A Branch.

Jerry Hendrickson: Great photo of Knoxville to Alcoa local.

Benjamin Schlechter: Both ex-Southern high hoods!

CSX/L&N

Aaron Bryant posted five photos with the comment: "The Louisville & Nashville, bridge over the Tennessee River, in Knoxville, Tn. I'm not sure when it was constructed, but it's interesting that it's painted orange in honor of UT, which can be seen in the distance. Photos taken: 12/28/19."

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I don't think that is orange paint. I think that is rust!

Street View

Aaron Bryant posted a couple of the photos again.

Jeff McNally: I helped paint it in 1986. It will never be painted. CSX says that it’s cheaper to replace still when needed. Anyway great picture. I’m retired now.

Ray PL: I understand the physics of the center truss bridge, but what is the reason/advantages for the two that are inverted?

Dennis DeBruler commented on Ray's comment
A deck truss generally has the advantage of using shorter piers than a through truss. I included another photo by Aaron that shows how the far, non-transition pier is shorter.
Looking at these photos, it just now occurred to me that for a deck truss the steel girders that hold the rails probably help provide strength for the top chord. The top chord of a truss is in compression and the bottom chord is in tension. Steel is stronger in tension than it is in compression. Thus it needs more material to handle compression loads.